EP2859229B1 - Blitzenergieübertragungseinheit für eine windturbine - Google Patents

Blitzenergieübertragungseinheit für eine windturbine Download PDF

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Publication number
EP2859229B1
EP2859229B1 EP13728949.2A EP13728949A EP2859229B1 EP 2859229 B1 EP2859229 B1 EP 2859229B1 EP 13728949 A EP13728949 A EP 13728949A EP 2859229 B1 EP2859229 B1 EP 2859229B1
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EP
European Patent Office
Prior art keywords
lightning current
current transfer
transfer unit
arm
spark gap
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Application number
EP13728949.2A
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English (en)
French (fr)
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EP2859229A1 (de
Inventor
Claus Grøn LYNGBY
Kent Bach LØNBÆK
Anders Niels Hansen
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Vestas Wind Systems AS
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Vestas Wind Systems AS
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
    • F03D—WIND MOTORS
    • F03D80/00—Details, components or accessories not provided for in groups F03D1/00 - F03D17/00
    • F03D80/50—Maintenance or repair
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
    • F03D—WIND MOTORS
    • F03D80/00—Details, components or accessories not provided for in groups F03D1/00 - F03D17/00
    • F03D80/30—Lightning protection
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
    • F05D2260/00—Function
    • F05D2260/30—Retaining components in desired mutual position
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00—Energy generation through renewable energy sources
    • Y02E10/70—Wind energy
    • Y02E10/72—Wind turbines with rotation axis in wind direction

Definitions

  • the invention relates to a lightning current transfer unit (LCTU) for a wind turbine and, in particular, to a lightning current transfer unit for use in, but limited to use in, a wind turbine for large scale electricity generation on a wind farm.
  • LCTU lightning current transfer unit
  • Figure 1 illustrates a typical wind turbine 1 for use in large scale electricity generation on a wind farm. It includes a tower 2 and a wind turbine nacelle 3 positioned on top of the tower.
  • the wind turbine rotor comprising three wind turbine blades 5 connected to a hub 4, is connected to the nacelle through a main shaft (not shown in Figure 1 ) which extends out of the nacelle front. Wind beyond a certain level activates the rotor due to lift induced on the blades and causes it to rotate. The rotation is converted to electric power, which is supplied to the electricity grid.
  • wind turbines are located on exposed sites to maximize exposure to the wind, but they are also very exposed to lightning strikes which may cause extensive damage to a wind turbine. Thus, wind turbines are typically provided with a lightning protection system.
  • FIGs 2a and 2b illustrate the typical lightning protection system in each of the wind turbine blades 5 (a single blade is shown in these Figures).
  • the blades and, in particular, the tip of the blades are the most likely component of a wind turbine to be susceptible to a lightning strike as they are the component that project highest.
  • the wind turbine blade 5 of Figure 2a includes a tip with a metal receptor 8 that intercepts lightning strikes 7 that is grounded or earthed.
  • the receptor is connected to a lightning down conductor 9 inside the wind turbine blade.
  • the down conductor extends through the blade in the longitudinal direction and ends at the hub 4.
  • Figure 2b illustrates schematically one known arrangement in which lightning current is transferred from the lightning down conductor 9 to the rest of the lightning protection system and to ground.
  • the lightning current is transferred to the main shaft 10 of the wind turbine through a pitching mechanism 13 or any other mechanism between the blade and the shaft.
  • the nacelle 3 there are sliding contacts or slip rings in contact with the shaft in order to carry current from the shaft.
  • the slip rings are connected to ground 11 by a down conductor extending through the wind turbine tower 1.
  • the lightning current transfer unit 15 of Figure 3a forms an electrical connection between a lightning down conductor of each blade 5 of the rotor via an electrically conducting ring or blade band 18 around the outside of each blade of the wind turbine and a lightning down conductor of the nacelle 3 via an electrically conducting ring or lightning ring 16 on the nacelle.
  • the lightning current transfer unit 15 is mounted on a protruding portion 21 of the hub 4 on the inside of the hub facing the nacelle 3.
  • the lightning current transfer unit 15 projects outwardly between the inside surfaces of the hub and nacelle in a space between the wind turbine blade and the front of the nacelle.
  • the lightning connection means or lightning current transfer unit is mounted to the hub, it rotates with the hub.
  • each blade 5 surrounds the root of the blade.
  • Each ring forms a contact surface 18 on the root of the wind turbine above the pitching mechanism and perpendicular to the longitudinal direction of the blade. The contact surface thus rotates with pitching of the blade.
  • Each ring is connected to the lightning down conductor 9 inside the wind turbine blade as described above.
  • the electrically conducting or metal ring 16 on the outside of the nacelle 3 facing the hub 4 is mechanically connected to the nacelle. It is electrically connected to a lightning down conductor 14 of the nacelle.
  • the metal ring 16 forms a contact surface 17 to the lightning current transfer unit 15.
  • FIGS 3b and 3c closer illustrate the position of the lightning current transfer unit 15 in relation to the contact surface 18 on the wind turbine blade and the contact surface 17 on the nacelle. It also illustrates the different sections of the lightning current transfer unit 15, which include a base support part 22, two contact means 19a, 19b and flexible links 26, 27 between the base support part and the two contact means.
  • the flexible links ensure that the two contact means are forced against the contact surface 18 on the wind turbine blade 5 and the contact surface 17 of the nacelle 3, respectively.
  • the two contact means 19 and the two contact surfaces 17,18 establish two contact areas 20a, 20b.
  • the first of the contact areas 20a ensures a constant contact to the electrically conducting ring 18 of the blade 5 and the other 20b to the electrically conducting ring 16 of the nacelle 3.
  • the two contact means 19a, 19b are connected by a dedicated electric connection 30 in the form of a wire or cable.
  • Each of the contact means 19a, 19b also comprises a retaining bolt 28, 29 for the dedicated electric connection 30 allowing the electric connection to be established and retained between the two contact means.
  • the electric connection 30 is made of a flexible material with a length corresponding to the distance between the two contact means at their rest position, when they are furthest apart. If the lightning connection means or lightning current transfer unit 15 is exposed to forces the flexible link will bend resulting in a more sagging dedicated electric connection 30.
  • Figure 4 illustrates schematically the contact areas of the lightning connection means or lightning current transfer unit sliding on the conducting ring or lightning ring 17 of the nacelle 3. It illustrates the situation of a rotating three-bladed wind turbine rotor with three lightning connection means including contact means 20b.
  • each lightning connection means is mounted on the hub and main shaft 14 they will rotate with the main shaft as the centre of rotation. Further, the contact means is positioned at a distance from the centre corresponding to the diameter of the ring. The contact means will thus perform a circular rotation facing the ring while being continuously forced against the surface of the ring.
  • Figure 5 illustrates the contact surface 18 of the blade 5.
  • the contact means 20a is continuously forced against the contact surface or blade band and slides on the surface when the blade is pitched to one or the other side.
  • EP2336560 describes a lightning current transfer unit for a wind turbine comprising a spark gap with spark gap electrodes that are stationary relative to each other.
  • WO2012/016568 describes a lightning current transfer unit for a wind turbine comprising an electrode and a slideway which together form a spark gap.
  • DE4445899 describes a lightning current transfer unit for a wind turbine with rotor blades that are galvanically separated from ground during normal operation of the wind turbine.
  • a lightning current transfer portion comprising a spark gap formed between an electrical connection to the first portion that has an electrical coupling to the blade and an electrical connection to the second portion that has an electrical coupling to the nacelle.
  • the electrical connections being moveable with their respective first or second portion.
  • the spark gap has a spark gap distance.
  • the lightning current transfer portion is configured such that the distance is substantially constant during movement of the first portion, the second portion and electrical connections and such that lightning current is transferred from the first portion to the second portion.
  • a preferred embodiment of the invention is described in more detail below and takes the form of a lightning current transfer unit for a wind turbine, the lightning current transfer unit comprising a first portion configured to be electrically coupled to an electrically conducting portion of a blade of a wind turbine electrically connected to a down conductor of the blade and a second portion configured to be electrically coupled to an electrically conducting portion of a nacelle of the wind turbine connected to a down conductor connected to earth.
  • the first portion and the second portion are both independently movable to maintain electrical coupling to the electrically conducting portion of the blade and nacelle respectively.
  • a lightning current transfer portion is provided that comprises a spark gap formed between an electrical connection to the first portion and an electrical connection to the second portion.
  • the electrical connections are moveable with their respective first or second portion.
  • the spark gap has a spark gap distance and the lightning current transfer portion is configured such that the distance is substantially constant during movement of the first portion, second portion and electrical connections and such that lightning current is transferred from the first portion to the second portion.
  • a lightning current transfer unit for a wind turbine, the lightning current transfer unit comprising: a first portion configured to be electrically coupled to an electrically conducting portion of a blade of a wind turbine electrically connected to a down conductor of the blade; a second portion configured to be electrically coupled to an electrically conducting portion of a nacelle of the wind turbine connected to a down conductor connected to earth; the first portion and the second portion both being independently movable to maintain electrical coupling to the electrically conducting portion of the blade and nacelle respectively; and a lightning current transfer portion comprising a spark gap between an electrical connection to the first portion and an electrical connection to the second portion, wherein the spark gap has a spark gap distance and the lightning current transfer portion is configured such that the distance is substantially constant during movement of the first portion and the second portion and such that lightning current is transferred from the first portion to the second portion.
  • the electrical connection to the first portion comprises a first arm.
  • the electrical connection to the second portion comprises a second arm.
  • the first arm or the second arm may comprise a first edge portion projecting between the blade and nacelle forming an edge of the spark gap.
  • the other of the first arm or the second arm may comprise a second edge portion projecting towards the first edge portion forming another edge of the spark gap.
  • the second edge portion may be narrower than the first edge portion.
  • the spark gap distance may be the distance between the edges of the spark gap in a direction perpendicular to the edges.
  • the spark gap distance may be between 5mm and 6mm.
  • the first portion may be located on a first forcing arm that forces the first portion against the electrically conducting portion of the blade.
  • the second portion may be located on a second forcing arm that forces the second portion against the electrically conducting portion of the nacelle.
  • the first forcing arm may be located on a hub of the wind turbine.
  • the second forcing arm may be located on a hub of the wind turbine.
  • the force that forces the first forcing arm may be provided by a first resilient portion.
  • the first resilient portion may be located at the hub end of the first forcing arm.
  • the force that forces the second forcing arm may be provided by a second resilient portion.
  • the second resilient portion may be located at the hub end of the second forcing arm.
  • the first portion and the second portion may each be movable in two dimensions.
  • FIG. 6 illustrates a lightning current transfer unit 100 for a wind turbine embodying the present invention. It is similar in many respects to the prior art lightning current transfer unit 15 of Figures 3a to 5 and like features have been given like reference numerals. Like the lightning current transfer unit 15 of Figures 3a to 5 the lightning current transfer unit of Figure 6 has a first portion or wear pad 20a configured to be electrically coupled to an electrically conducting portion 18 of a blade 5 or blade band of a wind turbine 1 (a conducting or metal ring around the root of the blade) electrically connected to a down conductor of the blade and a second portion or wear pad 20b configured to be electrically coupled to an electrically conducting portion of a nacelle 3 or lightning ring of the wind turbine 1 (an electrically conducting ring on the front of the nacelle facing the hub 4) connected to a down conductor connected to earth.
  • a first portion or wear pad 20a configured to be electrically coupled to an electrically conducting portion 18 of a blade 5 or blade band of a wind turbine 1 (a conducting or
  • the first portion and the second portion are both independently movable in two dimensions (in a curve) to maintain electrical coupling to the electrically conducting portion of the blade and nacelle respectively.
  • the lightning current transfer unit 100 is mounted on a protruding portion 21 of the hub on the inside of the hub facing the nacelle and projects outwardly between the inside surfaces of the hub and nacelle in a space between the wind turbine blade and the front of the nacelle.
  • the first portion and second portion are each located on a respective forcing arm 26,27 that forces the first portion against the electrically conducting portion of the blade and the second portion against the electrically conducting portion of the nacelle respectively.
  • the forcing arms are located on the hub of the wind turbine.
  • the force that forces the forcing arm is provided by a resilient portion of bent metal 102 of each of the arms located at the hub end of each of the arms.
  • the forcing arms also include a rigid portion 103 of fibre reinforced plastics that extends from the resilient portion to the free end where the first and second portions are respectively connected.
  • lightning current transfer unit 100 is distinguished over the prior art arrangement of Figures 3a to 5 by including a lightning current transfer portion 104 comprising a spark gap 106 formed between an electrical connection to the first portion in the form of an arm, spark arm or electrode (a first arm 108) and an electrical connection to the second portion also in the form of an arm, spark arm or electrode (a second arm 110).
  • the electrical connections are moveable with their respective first or second portion.
  • the spark gap has a spark gap distance 111 that is constant during movement of the first portion, the second portion and the electrical connections such that lightning current may be transferred from the first portion to the second portion.
  • the spark gap is open. There is no direct contact between the first and second arms.
  • the LCTU described is expected to have a life time of up to 20 years (the expected life of a wind turbine). Nevertheless, if there is damage from a lightning blast it is expected to result only in erosion of the spark arms without spark damage to the blade band or the lightning ring of the nacelle.
  • the spark arms are readily replaceable.
  • the space around the LCTU means that it is easy to inspect for damage. Given the similarity between prior art LCTUs particularly in the use of the same blade band, lightning ring of the nacelle and connection to the hub, the arrangement described herein is easy to implement on existing wind turbines.
  • the first arm 108 has an edge portion 114 forming a tip in the form of a nub or bar 115 that forms an edge of the spark gap 106.
  • the nub extends straight, slightly, towards and away from the hub.
  • the first arm extends away from the nub of the edge portion, away from the spark gap 106, curves, then extends straight towards the blade, curves again before extending again in a direction away from the spark gap where it is connected to the first portion 20a through a through hole 121.
  • the second arm 110 has an edge portion or bar 112 that projects between the blade and the nacelle forming the other edge of the spark gap. The free ends 117 of the bar are curved.
  • the edge portion or bar has a body 113 extending from it forming a connector for connection to the second portion 20b.
  • the connector extends firstly towards the hub, then curves and extends towards the nacelle and then curves again to extend perpendicular to these two directions where it is connected to the second portion through a through hole 119.
  • the tip or nub 115 of the first arm 108 that projects towards the other edge portion is much narrower than the other edge portion or bar 112 of the second arm 110 forming the other edge of the spark gap.
  • the shape of the arms reflects the tolerances of the LCTU.
  • the spark gap distance 111 is the distance between the edges of the spark gap in a direction perpendicular to the edges. Typically, the spark gap distance is between 5mm and 6mm.
  • the first and second arms 108, 110 are mechanically and electrically connected to their respective portion 20a, 20b by a threaded fastener (a bolt) 123 passing through the through hole 119, 121 at the respective arm end and fastened to a complementary threaded hole in the first portion and second portion respectively.
  • a threaded fastener a bolt
  • the second portion has a ship-shape or hexagonal face 116.
  • the first portion has a circular face 118.
  • the first and second arms 108, 110 move relative to one another as the first and second portions 20a, 20b move as they are forced against their respective conducting portion (blade band or lightning ring).
  • the spark gap distance 111 where lightning current is transferred or passed between them, is constant or is maintained.
  • Figures 7, 8 and 9a to 9c Another arrangement of the first arm 108 and second arm 110 is shown in Figures 7, 8 and 9a to 9c . It is similar in many respects to the arrangement of Figure 6 and like features have been given like reference numerals.
  • Figures 7 and 8 illustrate the shape of the first arm and second arm respectively.
  • Figures 9a to 9c illustrate the LCTU with this particular arm configuration in use.
  • the general configuration is the same as that of Figure 6 in that the first arm 108 electrically coupled to the first portion 20a that is electrically coupled to the blade band forms a narrow edge to the spark gap and the second arm 110 electrically coupled to the second portion 20b that is electrically coupled to the lightning ring forms a long, straight edge to the spark gap. It is configured as follows.
  • the first arm 108 illustrated best in Figure 7 , on the blade side of the LCTU, that is connected to the first portion 20a (not shown in Figure 7 ) is configured to be electrically coupled to an electrically conducting portion of the blade or blade band, has an edge portion 112 that is relatively narrow. It is narrower than the other edge portion 114 of the second arm 110 described below. It forms a tip. The edge portion projects towards the other edge portion forming another edge of the spark gap in the form of a nub 150 that extends, slightly, towards and away from the hub when in position on the wind turbine with sloped sides 152 (in contrast to the straight sides of the example of Figure 6 ).
  • the first arm of this example extends away from the nub of the edge portion, away from the spark gap, then bends towards the blade, before extending again in a direction away from the spark gap where it is connected to the first portion 20a through a through hole 119.
  • the second arm 110 illustrated best in Figure 8 , on the nacelle side of the LCTU, that is connected to the second portion 20b configured to be electrically coupled to an electrically conducting portion of the nacelle or lightning ring, has an edge portion, rail or sliding rail 114 that projects straight between the blade and the nacelle forming an edge of the spark gap.
  • the edge 154 of the edge portion forming an edge of the spark gap is curved perpendicular to an axis between the blade and nacelle.
  • the second arm has a free end 156 facing the blade when in position on the wind turbine.
  • Figures 9a to 9c illustrate the LCTU 100 with the first and second arms 108, 110 of Figures 7 and 8 in use.
  • the first and second arms move relative to one another as the first and second portions move as they are forced against their respective conducting portion (blade band or lightning ring).
  • the spark gap distance 111 is constant.
  • Figure 9a shows the largest possible distance between the blade band and the sliding rail (second arm 110). That is to say, the narrow edge portion 112 of the first arm 108 is facing the free end 156 of the sliding rail or second arm.
  • Figure 9b shows the shortest possible distance between the blade band and the sliding rail. That is to say, the narrow edge portion of the first arm is facing the nacelle end of the sliding rail or second arm.
  • Figure 9c shows the narrow edge portion of the first arm is facing the middle of the sliding rail or second arm where it is generally located.

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  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Sustainable Development (AREA)
  • Sustainable Energy (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Wind Motors (AREA)
  • Elimination Of Static Electricity (AREA)

Claims (15)

  1. Blitzstromübertragungseinheit (100) für eine Windturbine (1), wobei die Blitzstromübertragungseinheit umfasst:
    einen ersten Abschnitt (20a), der konfiguriert ist, um elektrisch mit einem elektrisch leitenden Abschnitt (18) eines Blatts (5) einer Windturbine, der elektrisch mit einem Ableiter des Blatts verbunden ist, gekoppelt zu sein;
    einen zweiten Abschnitt (20b), der konfiguriert ist, um elektrisch mit einem elektrisch leitenden Abschnitt der Gondel (3) der Windturbine, der elektrisch mit einem mit der Erde verbundenen Ableiter verbunden ist, gekoppelt zu sein;
    wobei sowohl der erste Abschnitt (20a) als auch der zweite Abschnitt (20b) unabhängig voneinander beweglich sind, um eine elektrische Kopplung mit dem elektrisch leitenden Abschnitt des Blatts (5) bzw. der Gondel (3) aufrechtzuerhalten; und
    einen Blitzstromübertragungsabschnitt (104), der eine Funkenstrecke (106) umfasst, die zwischen einer elektrischen Verbindung (108) mit dem ersten Abschnitt (20a) und einer elektrischen Verbindung (110) mit dem zweiten Abschnitt (20b) gebildet ist; dadurch gekennzeichnet, dass
    die elektrische Verbindung mit dem ersten Abschnitt in der Form eines ersten Arms (108) vorliegt und die elektrische Verbindung mit dem zweiten Abschnitt in der Form eines zweiten Arms (110) vorliegt und der erste und der zweite Arm die Funkenstrecke (106) bilden und die elektrischen Verbindungen in der Form des ersten Arms (108) und des zweiten Arms (110) mit ihrem jeweiligen ersten (20a) oder zweiten Abschnitt (20b) beweglich sind, wobei die Funkenstrecke (106) einen Funkenstreckenabstand aufweist und wobei der Blitzstromübertragungsabschnitt konfiguriert ist, sodass der Abstand während einer Bewegung des ersten Abschnitts, des zweiten Abschnitts und der elektrischen Verbindungen im Wesentlichen konstant ist und sodass ein Blitzstrom von dem ersten Abschnitt zu dem zweiten Abschnitt übertragen wird.
  2. Blitzstromübertragungseinheit nach Anspruch 1, wobei der erste Arm (108) oder der zweite Arm (110) einen ersten Kantenabschnitt (114) umfasst, der zwischen dem Blatt und der Gondel vorsteht und eine Kante der Funkenstrecke (106) bildet.
  3. Blitzstromübertragungseinheit nach Anspruch 2, wobei der andere von dem ersten Arm (108) oder dem zweiten Arm (110) einen zweiten Kantenabschnitt (112) umfasst, der in Richtung zu dem ersten Kantenabschnitt (114) vorsteht und eine andere Kante der Funkenstrecke bildet.
  4. Blitzstromübertragungseinheit nach Anspruch 3, wobei der zweite Kantenabschnitt (112) schmaler als der erste Kantenabschnitt (114) ist.
  5. Blitzstromübertragungseinheit nach Anspruch 3 oder Anspruch 4, wobei der Funkenstreckenabstand der Abstand zwischen den Kanten der Funkenstrecke (106) in einer Richtung senkrecht zu den Kanten ist.
  6. Blitzstromübertragungseinheit nach einem vorstehenden Anspruch, wobei der Funkenstreckenabstand zwischen 5 mm und 6 mm liegt.
  7. Blitzstromübertragungseinheit nach einem vorstehenden Anspruch, wobei sich der erste Abschnitt (20a) auf einem ersten Druckarm (26) befindet, der den ersten Abschnitt gegen den elektrisch leitenden Abschnitt (18) des Blatts (5) drückt.
  8. Blitzstromübertragungseinheit nach einem vorstehenden Anspruch, wobei sich der zweite Abschnitt (20b) auf einem zweiten Druckarm (27) befindet, der den zweiten Abschnitt gegen den elektrisch leitenden Abschnitt der Gondel drückt.
  9. Blitzstromübertragungseinheit nach Anspruch 7 oder 8, wobei sich der erste Druckarm (26) auf einer Nabe der Windturbine befindet.
  10. Blitzstromübertragungseinheit nach Anspruch 7, 8 oder 9, wobei sich der zweite Druckarm (27) auf einer Nabe der Windturbine befindet.
  11. Blitzstromübertragungseinheit nach einem der Ansprüche 7 bis 10, wobei die Kraft, die den ersten Druckarm (26) drückt, durch einen ersten elastischen Abschnitt bereitgestellt wird.
  12. Blitzstromübertragungseinheit nach Anspruch 11, wobei sich der erste elastische Abschnitt an dem Nabenende des ersten Druckarms befindet.
  13. Blitzstromübertragungseinheit nach einem der Ansprüche 7 bis 12, wobei die Kraft, die den zweiten Druckarm (27) drückt, durch einen zweiten elastischen Abschnitt bereitgestellt wird.
  14. Blitzstromübertragungseinheit nach Anspruch 13, wobei sich der zweite elastische Abschnitt an dem Nabenende des zweiten Druckarms (27) befindet.
  15. Blitzstromübertragungseinheit nach einem vorstehenden Anspruch, wobei der erste Abschnitt (20a) und der zweite Abschnitt (20b) jeweils in zwei Dimensionen beweglich sind.
EP13728949.2A 2012-06-08 2013-06-06 Blitzenergieübertragungseinheit für eine windturbine Active EP2859229B1 (de)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
US201261657091P 2012-06-08 2012-06-08
DKPA201270374 2012-06-28
PCT/DK2013/050176 WO2013182202A1 (en) 2012-06-08 2013-06-06 A lightning current transfer unit for a wind turbine

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EP2859229A1 EP2859229A1 (de) 2015-04-15
EP2859229B1 true EP2859229B1 (de) 2019-03-20

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US (1) US9709039B2 (de)
EP (1) EP2859229B1 (de)
CN (1) CN104520583B (de)
IN (1) IN2014DN10772A (de)
WO (1) WO2013182202A1 (de)

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JP6838181B1 (ja) * 2020-02-26 2021-03-03 三菱重工業株式会社 風車翼
WO2024067930A1 (en) 2022-09-30 2024-04-04 Vestas Wind Systems A/S Improvements relating to wind turbine blade anti-icing systems

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Also Published As

Publication number Publication date
EP2859229A1 (de) 2015-04-15
US20150132133A1 (en) 2015-05-14
WO2013182202A1 (en) 2013-12-12
CN104520583A (zh) 2015-04-15
US9709039B2 (en) 2017-07-18
CN104520583B (zh) 2017-05-24
IN2014DN10772A (de) 2015-09-04

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